R version 2.12.1 (2010-12-16)
Copyright (C) 2010 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i486-pc-linux-gnu (32-bit)

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> x <- c(4,5,3,4,5,3,7,5,6,3,2,4,5,2,3,6,4,4,6,2)
> par1 = ''
> xlab = 'Score'
> main = 'Smokers rating Hot Curries'
> postscript(file="/var/www/rcomp/tmp/1x8xt1323016092.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> par1 <- as.numeric(par1)
> myhist<-hist(x, breaks=par1, col=2, xlab=xlab, main=main)
Error in hist.default(x, breaks = par1, col = 2, xlab = xlab, main = main) : 
  invalid number of 'breaks'
Calls: hist -> hist.default
Execution halted